Draggable helper position largely offsets on entering/leaving sortables when being placed in floating and/or relative positioned parent elements

A list of draggables, and some sortables are being placed in separate, floated and/or relative positioned elements. Now when a draggable helper enters and leaves two or more sortables in a relatively fast fashion, it is being offset horinzontally in case floating and realtive positioning is enabled, and vertically in case only relative positioning is enabled.

Side note, I've stumbled over this when using bootstrap columns, wich are using floating and relative positioning.

Working example: http://jsfiddle.net/zxysqvv5/

Screencast: http://i.imgur.com/rEX4IZv.gif

Working example: http://jsfiddle.net/e33jmm3w/

Screencast: http://i.imgur.com/zvBzqcj.gif

refs #11085, #10669, #11612, #11580, #11250,